phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('2bd97cb8e3e7c8d2fe2e6eb0f3cd9439', -1, 1751209188, 1751209188, '0a020003', 1, 0, 0)

Line : 187
File : sessions.php